Complex dynamics of natural particle systems, such as insect swarms, bird flocks, fish schools, has attracted great attention of scientists for years. Measuring 3D trajectory of each individual in a group is vital for quantitative study of their dynamic properties, yet such empirical data is rare mainly due to the challenges of maintaining the identities of large numbers of individuals with sim...

This paper presents the development of hall effect sensor for measuring the contamination of lubricant in industry. This technique is based on the principle of the magnetic field and Hall Effect. The magnetic field is made up of a permanent magnet which is measured by a Hall Effect sensor. The measured magnetic field can be estimated the level of contaminants in the oil by the ferrous particles...

Fertilizer spreaders are traditionally tested by using the collecting tray method . This method requires large indoor test facilities and is very expensive when applied on a large scale . A proposed alternative method is to measure the velocity and diameter of individual fertilizer particles emanating from the spreader and use a model to predict the landing spot of individual particles . The to...

With a stationary random process of convex particles, we associate a density with values in the space of symmetric tensors of rank two, as a means of describing and measuring the anisotropy and mean orientation of the particles. The main result is a stereological formula allowing us to estimate this tensor from measurements in planar sections. MSC 2000: 60D05, 52A22.